Accession Number : AD0720389

Title :   New Chromium-Base Material with Magnesium Oxide Additives,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Khodkin,V. I. ; Semina,L. V. ; Gerasimova,M. I.

Report Date : 23 NOV 1970

Pagination or Media Count : 14

Abstract : The properties of dispersion-strengthened chromium-base alloy containing 3-9 percent MgO have been investigated. Additions of up to 5 per cent MgO increased the alloy compactibility because MgO acts as a lubricant. Increasing the MgO content above 5 percent resulted in a lower density of the alloy due to the increasing magnitude of elastic aftereffects. MgO improved the sinterability of the alloy by forming binary compounds (spinels) with the Cr sub 2 O sub 3 existing on the surface of Cr powder particles which retards the sintering process. The strength and plasticity of the alloy increased with increasing MgO content. The presence of MgO also retarded the grain growth in the deformed alloy at temperatures up to 1400-1500 degrees C.

Descriptors :   (*CHROMIUM, *DISPERSION HARDENING), MAGNESIUM OXIDES, POWDER METALLURGY, COMPACTING, SINTERING, MECHANICAL PROPERTIES

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE